!!! Warning !!!
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Avoid Off-The-Shelf additives such as Barr Stop-Leak [spit].
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A couple-three years ago, our 1997 radiator was seeping from the top tank.
While the engine was hot and running, I added a tiny car of Barr Stop-Leak [spit].
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That stuff [spit] plugged the heater core, plugged the head coolant channels in our mighty Cummins 8.3, plugged all the hoses, and generally made a mess of things.
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And yet, the top tank seep continued.
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I dismantled the entire cooling system, rigged a power flusher through a stand-alone diesel-fired high-pressure pressure worsher.
Hours later, I was still seeing grime flushing our, looking suspiciously similar to Barr Stop-Leak [spit].
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I ended-up replacing the radiator and heater-core plus the heater hoses.
New water-pump and both thermostats.
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Now, let's not be quick to judge Barr Stop-Leak [spit] as the cause of the entire cooling system blockage.
But the timing seems awkward...
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